/Engine/Plugins/Online/OnlineSubsystemUtils/Source/OnlineSubsystemUtils/Public/Online/OnlineServicesEngineUtils.h
the array of valid credentials the user has setup for Play In Editor (PIE)
void GetPIELogins ( [TArray](API\Runtime\Core\Containers\TArray)< [FAuthLogin::Params](API\Plugins\OnlineServicesInterface\Online\FAuthLogin\Params) > & Logins ) const